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Understanding sliding window technique for partitioned tables - SQL Server 2012

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Hi,

reading this article http://blogs.msdn.com/b/sqlcat/archive/2013/09/16/top-10-best-practices-for-building-a-large-scale-relational-data-warehous.aspx?wa=wsignin1.0

where it is reported "Always keep empty partitions at both ends of the partition range to guarantee that the partition split (before loading new data) and partition merge (after unloading old data) do not incur any data movement."

if I want to create daily partitions, how can I create empty partitions between the daily partitions created?

Thanks


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